I don't believe that no one deserves to die but I do believe that 90% of people don't deserve to die~ I mean, if you found Hitler's premonitory corpse, would you do something about it knowing you'd save countless lives leaving it be?
What's the situation here? Did I go back in time? Hitler had a different fate in our timeline, so what changed? Did someone else come back and plan to kill him? If so, I'd be forced to do something.
The most important thing is preserving the timeline. By altering the past that significantly, you would be wiping from existence many times more people than were killed in the war.
Now, if I didn't go back in time, but were instead an individual in pre-war Europe, and I had a vision of Hitler doing terrible things in the future, and then I saw the premonitory corpse. In that case, I would leave it be, since I don't have to preserve a timeline that hasn't happened yet, and I can save countless lives.